Pressure regulating and releasing device

Abstract

The utility model relates to the technical field of valves, and discloses a pressure regulating and releasing device which comprises an air path block, a stepped inner hole, an air source hole, a pilot air hole and a valve cover which are detachably mounted on the air path block, an exhaust hole is formed in the valve cover, and a piston and a valve body are connected to the stepped inner hole in a sliding manner. A spring is arranged between the piston and the valve cover, and the valve body comprises a valve shell and a valve element. The spring is matched with the air pressure of the pilot air cavity so as to push the piston, the piston and the valve body form a double-piston structure, and the stability of switching control is improved; the piston and the valve body are arranged in the stepped inner hole in the gas path block at the same time, so that the integration degree of the whole device is improved, and the overall size is reduced; a nut of a welding standard part is matched with the adjusting bolt on the valve cover, so that the manufacturing cost is further reduced; the spring is radially supported through the valve cover, the situation that the spring is bent due to no support in the compression period is prevented, and the stability and reliability of operation of the device are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a pressure regulating and relief device. Background Art

[0002] A hold-in-place switching valve is a common valve used in pneumatic systems. Its primary function is to maintain a specific operating position until an external signal or pressure changes. With the rapid development of industrial automation, particularly in precision machinery, automated production lines, robotics, and pneumatic control systems, the demand for precise control, stability, and reliability is increasing. Hold-in-place switching valves were developed to meet these needs.

[0003] Traditional pneumatic valves often fail to maintain their operating position when an external signal is lost. However, a hold-in-place switching valve maintains the current position of a pneumatic actuator or other pneumatic component using pilot air or other control signals, preventing system drift or unstable operation caused by air pressure fluctuations. This approach not only improves system reliability but also reduces energy consumption, particularly in applications requiring precise control of cylinder position and actuator status. However, existing conventional hold-in-place switching valves are bulky, lack integration, lack functionality customization, and are relatively expensive, hindering widespread adoption. Utility Model Content

[0004] The purpose of the utility model is to provide a pressure regulating and pressure relief device to solve the problem that the existing position-holding switching valve is large in size and low in integration.

[0005] and a valve body having a top end and a bottom end, and a valve body having a bottom end and a bottom end, and a valve body having a bottom end and a bottom end.

[0006] In order to better realize the present invention, further, an adjusting bolt is axially slidably connected to the valve cover, the spring abuts against the end of the adjusting bolt, a nut is threadedly connected to the adjusting bolt, and the nut is fixedly connected to the valve cover.

[0007] In order to better realize the present utility model, further, a first sealing ring is provided on the piston, and a second sealing ring is provided on the valve housing; the first sealing ring and the second sealing ring are both used to improve the air tightness of the pilot air chamber.

[0008] In order to better realize the present invention, further, a valve cover is installed on the air circuit block, the valve cover is coaxially arranged with the spring, and the spring is placed in the axial through hole of the valve cover.

[0009] In order to better realize the utility model, further, the valve cover screws are installed on the gas circuit block.

[0010] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0011] (1) The utility model pushes the piston by cooperating with the air pressure of the spring and the pilot air chamber, forming a double-piston structure with the valve body, thereby improving the stability of the switching control; by arranging the piston and the valve body in the stepped inner hole on the air path block at the same time, the integration of the entire device is improved and the overall volume is reduced;

[0012] (2) The utility model changes the compression amount of the spring by setting an adjusting bolt, thereby changing the conditions for triggering pressure relief, which is easy to adjust; by welding a standard nut on the valve cover to cooperate with the adjusting bolt, the shell can further reduce the manufacturing cost;

[0013] (3) The utility model provides radial support for the spring through the valve cover, thereby preventing the spring from bending due to lack of support during compression, thereby improving the stability and reliability of the device operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional view of the overall structure of the utility model.

[0015] Among them: 1-air circuit block; 2-valve cover; 3-valve cover; 4-spring; 5-adjusting bolt; 6-piston; 7-first sealing ring; 8-valve housing; 9-second sealing ring; 10-valve core; 11-air source hole; 12-pilot air hole; 13-exhaust hole. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0018] Example 1:

[0019] This embodiment provides a pressure regulating and pressure relief device, specifically Figure 1 As shown, it includes an air circuit block 1, on which a stepped inner hole is axially arranged, and an air source hole 11 and a pilot air hole 12 are radially arranged on the air circuit block 1, wherein the air source hole 11 is at the end of the stepped inner hole, and the pilot air hole 12 is in the middle of the stepped inner hole; a valve cover 3 is detachably mounted on the air circuit block 1, and an exhaust hole 13 is radially arranged on the valve cover 3, and the stepped inner hole is close to one end of the valve cover 3 and is slidably connected to the piston 6, and the stepped inner hole is used to limit the piston 6 to prevent the piston 6 from blocking the pilot air hole 12 A spring 4 is provided between the piston 6 and the valve cover 3, and the end of the stepped inner hole away from the valve cover 3 is slidably connected to the valve body. The valve body includes a valve housing 8 and a valve core 10. The valve housing 8 is installed on the piston 6, and the valve core 10 is arranged on the valve housing 8; the air circuit block 1, the piston 6, and the valve cover 3 constitute an exhaust chamber; the air circuit block 1, the piston 6, and the valve body constitute a pilot air chamber; the air circuit block 1 and the valve body constitute an air source chamber; the exhaust hole 13 is in the exhaust chamber, the pilot air hole 12 is in the pilot air chamber, and the air source hole 11 is in the air source chamber.

[0020] When the valve core 10 is pressed by external force, the valve body is open, and when the pressure is removed, the valve body is automatically closed. The valve body is a commercial product, and its internal structure is understandable to those skilled in the art, so it will not be described in detail here.

[0021] The output gas source is used as the pilot gas. At this time, the pilot gas enters the pilot gas cavity through the pilot gas hole 12, and the gas source enters the gas source cavity from the gas source hole 11; the pilot gas and the gas source belong to the same pulse and have the same gas pressure.

[0022] When the downward thrust generated by the spring 4 on the upper surface of the piston 6 is greater than the thrust generated by the pilot gas on the lower surface of the piston 6, the resultant force on the piston 6 is downward. At this time, the piston 6 moves downward, causing the valve body to move synchronously, which makes the valve core 10 press against the wall of the gas circuit block 1, which is equivalent to the wall of the gas circuit block 1 pressing the valve core 10, which makes the valve body conductive. At this time, part of the gas in the gas source chamber enters the exhaust chamber through the valve body, and is then discharged through the exhaust hole 13, thereby achieving the purpose of pressure relief.

[0023] When the downward thrust generated by the spring 4 on the upper surface of the piston 6 is less than the thrust generated by the pilot gas on the lower surface of the piston 6, the resultant force on the piston 6 is downward, and the piston 6 moves upward. At this time, the valve core 10 is away from the wall of the gas circuit block 1, and the valve body cannot be conducted, thereby achieving the purpose of maintaining the pressure in the gas source chamber.

[0024] Example 2:

[0025] This embodiment is further expanded on the basis of the above embodiment. Figure 1 As shown, an adjusting bolt 5 is axially slidably connected to the valve cover 3 , the spring 4 abuts against the end of the adjusting bolt 5 , a nut is threadedly connected to the adjusting bolt 5 , and the nut is fixedly connected to the valve cover 3 .

[0026] By rotating the adjusting bolt 5 to change the insertion amount of the adjusting bolt 5 on the valve cover 3, the compression amount of the spring 4 is changed, and then the thrust of the spring 4 on the piston 6 is changed, thereby adjusting the air pressure of the pilot air chamber, that is, adjusting the pressure value of the pilot air.

[0027] The use of a standard nut for threaded connection with the adjusting bolt 5 can avoid the need to process an internal threaded hole on the valve cover 3, thereby reducing the processing difficulty and cost; and the nut is welded to the valve cover 3 by spot welding, which ensures its stability and can be removed by knocking without damaging the valve cover 3.

[0028] The other parts of this embodiment are the same as those of the above embodiment and will not be described in detail.

[0029] Example 3:

[0030] This embodiment is further expanded on the basis of the above embodiment. Figure 1 As shown, a first sealing ring 7 is mounted on the piston 6, and a second sealing ring 9 is mounted on the valve housing 8. Both the first sealing ring 7 and the second sealing ring 9 are used to improve the airtightness of the pilot air chamber and prevent unstable air pressure caused by gas leakage. Both the first sealing ring 7 and the second sealing ring 9 are standard parts, reducing manufacturing costs.

[0031] The other parts of this embodiment are the same as those of the above embodiment and will not be described in detail.

[0032] Example 4:

[0033] This embodiment is further expanded on the basis of the above embodiment. Figure 1 As shown, a valve cover 2 is installed on the air circuit block 1 . The valve cover 2 is coaxially arranged with a spring 4 , and the spring 4 is placed in an axial through hole of the valve cover 2 .

[0034] The inner diameter of the valve cover 2 is slightly larger than the outer diameter of the spring 4. The valve cover 2 is used to limit and straighten the radial direction of the spring 4 to prevent the spring 4 from bending due to radial lack of support when the adjusting bolt 5 squeezes the spring 4. Once the spring 4 bends, the pressure of the spring 4 on the piston 6 will change. Therefore, the valve cover 2 is provided to improve the stability and reliability of the operation of the device.

[0035] The other parts of this embodiment are the same as those of the above embodiment and will not be described in detail.

[0036] Example 5:

[0037] This embodiment is further expanded on the basis of the above embodiment. Figure 1 As shown, the valve cover 3 is screwed onto the gas circuit block 1. The quick disassembly and firmness of the screw installation facilitate the maintenance and repair of the valve body and related components during subsequent use.

[0038] The other parts of this embodiment are the same as those of the above embodiment and will not be described in detail.

[0039] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A pressure regulating and relief device, characterized in that: The invention comprises an air circuit block (1), wherein a stepped inner hole is axially arranged on the air circuit block (1), and an air source hole (11) and a pilot air hole (12) are radially arranged on the air circuit block (1), wherein the air source hole (11) is located at the end of the stepped inner hole, and the pilot air hole (12) is located in the middle of the stepped inner hole; a valve cover (3) is detachably mounted on the air circuit block (1), and an exhaust hole (13) is radially arranged on the valve cover (3), and an end of the stepped inner hole close to the valve cover (3) is slidably connected to a piston (6), and the stepped inner hole is used to limit the piston (6), and a spring (4) is arranged between the piston (6) and the valve cover (3), and an end of the stepped inner hole away from the valve cover (3) is slidably connected to a valve body, and the valve body comprises a valve housing (8) and a valve core (10), wherein the valve housing (8) is mounted on the piston (6), and the valve core (10) is arranged on the valve housing (8); The air circuit block (1), the piston (6), and the valve cover (3) form an exhaust chamber; the air circuit block (1), the piston (6), and the valve body form a pilot air chamber; the air circuit block (1) and the valve body form an air source chamber; the exhaust hole (13) is located in the exhaust chamber, the pilot air hole (12) is located in the pilot air chamber, and the air source hole (11) is located in the air source chamber.

2. A pressure regulating and relief device according to claim 1, characterized in that: An adjusting bolt (5) is axially slidably connected to the valve cover (3), the spring (4) abuts against the end of the adjusting bolt (5), a nut is threadedly connected to the adjusting bolt (5), and the nut is fixedly connected to the valve cover (3).

3. The pressure regulating and relief device according to claim 1, characterized in that: A first sealing ring (7) is sleeved on the piston (6), and a second sealing ring (9) is sleeved on the valve housing (8); the first sealing ring (7) and the second sealing ring (9) are both used to improve the air tightness of the pilot air chamber.

4. The pressure regulating and relief device according to claim 1, characterized in that: A valve cover (2) is mounted on the air circuit block (1), the valve cover (2) and the spring (4) are coaxially arranged, and the spring (4) is placed in an axial through hole of the valve cover (2).

5. The pressure regulating and relief device according to claim 1, characterized in that: The valve cover (3) is screwed onto the gas circuit block (1).

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